Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcDisplay\vendor\pvc\struct\tests\integration_tests\tree\search\SearchDepthFirstPreorderTest.php:22 Stack trace: #0 {main} thrown in I:\www\pvcDisplay\vendor\pvc\struct\tests\integration_tests\tree\search\SearchDepthFirstPreorderTest.php on line 22